﻿using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;
using System.Web;

namespace ART.Common
{
    //验证码操作类
    public class JVerifyCode
    {

        #region __________属性__________

        int length = 6;//验证码长度(默认6个验证码的长度)
        public int Length
        {
            get { return length; }
            set { length = value; }
        }

        int fontSize = 30;//验证码字体大小默认30像素
        public int FontSize
        {
            get { return fontSize; }
            set { fontSize = value; }
        }

        int padding = 0;//边框距离
        public int Padding
        {
            get { return padding; }
            set { padding = value; }
        }

        bool chaos = true;//是否输出燥点(默认不输出)
        public bool Chaos
        {
            get { return chaos; }
            set { chaos = value; }
        }

        Color chaosColor = Color.LightGray;//输出燥点的颜色(默认灰色)
        public Color ChaosColor
        {
            get { return chaosColor; }
            set { chaosColor = value; }
        }


        Color backgroundColor = Color.White;//自定义背景色(默认白色)
        public Color BackgroundColor
        {
            get { return backgroundColor; }
            set { backgroundColor = value; }
        }

        Color[] colors = { Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple };//自定义随机颜色数组
        public Color[] Colors
        {
            get { return colors; }
            set { colors = value; }
        }

        string[] fonts = { "Arial" };//{"宋体"};//自定义字体数组
        public string[] Fonts
        {
            get { return fonts; }
            set { fonts = value; }
        }
        string codeSerial = "0,1,2,3,4,5,6,7,8,9";//,a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z";//自定义随机码字符串序列(使用逗号分隔)

        public string CodeSerial
        {
            get { return codeSerial; }
            set { codeSerial = value; }
        }


        #endregion


       
        #region __________生成校验码图片__________
             
        public Bitmap CreateImageCode(string code)
        {
            int fSize = FontSize;
            int fWidth = fSize + Padding;
            int imageWidth = (int)(code.Length * fWidth) + 4 + Padding * 1;
            int imageHeight = fSize * 2 + Padding;
            System.Drawing.Bitmap image = new System.Drawing.Bitmap(imageWidth, imageHeight);
            Graphics g = Graphics.FromImage(image);
            g.Clear(BackgroundColor);
            Random rand = new Random();
            //给背景添加随机生成的燥点
            if (this.Chaos)
            {
                Pen pen = new Pen(ChaosColor, 0);
                int c = Length * 10;
                for (int i = 0; i < c; i++)
                {
                    int x = rand.Next(image.Width);
                    int y = rand.Next(image.Height);
                    g.DrawRectangle(pen, x, y, 1, 1);
                }
            }
            int left = 0, top = 0, top1 = 1, top2 = 1;
            int n1 = (imageHeight - FontSize - Padding * 2);
            int n2 = n1 / 4;
            top1 = n2;
            top2 = n2 * 2;
            Font f;
            Brush b;
            int cindex, findex;
            //随机字体和颜色的验证码字符
            for (int i = 0; i < code.Length; i++)
            {
                cindex = rand.Next(Colors.Length - 1);
                findex = rand.Next(Fonts.Length - 1);
                f = new System.Drawing.Font(Fonts[findex], fSize, System.Drawing.FontStyle.Bold);
                b = new System.Drawing.SolidBrush(Colors[cindex]);
                if (i % 2 == 1)
                {
                    top = top2;
                }
                else
                {
                    top = top1;
                }
                left = i * fWidth;
                g.DrawString(code.Substring(i, 1), f, b, left, top);
            }
            //画一个边框边框颜色为Color.Gainsboro
            g.DrawRectangle(new Pen(Color.Gainsboro, 0), 0, 0, image.Width - 1, image.Height - 1);
            g.Dispose();

            return image;
    
        }
   
        #endregion


          
        #region __________将创建好的图片输出到页面__________
    
        public void CreateImageOnPage(string code, HttpContext context)
    {
        System.IO.MemoryStream ms = new System.IO.MemoryStream();
        Bitmap image = this.CreateImageCode(code);
        image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
        context.Response.ClearContent();
        context.Response.ContentType = "image/Jpeg";
        context.Response.BinaryWrite(ms.GetBuffer());
        ms.Close();
        ms = null;
        image.Dispose();
        image = null;
    }
  
        #endregion


        #region __________生成随机字符码__________
   
        public string CreateVerifyCode(int codeLen)
    {
        if (codeLen == 0)
        {
            codeLen = Length;
        }
        string[] arr = CodeSerial.Split(',');
        string code = "";
        int randValue = -1;
        Random rand = new Random(unchecked((int)DateTime.Now.Ticks));
        for (int i = 0; i < codeLen; i++)
        {
            randValue = rand.Next(0, arr.Length - 1);
            code += arr[randValue];
        }
 
        return code;
    }
  
        public string CreateVerifyCode()
    {
        return CreateVerifyCode(0);
    }
  
        #endregion


    }
}
